Seiko Cal. 3891 - 991

The Seiko 3891-991 represents an important milestone in Seiko's 1966 lineup. The Fixed bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-38fe3fdb1cd3]

Also known as: UFO

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

38mm

Case Thickness

8.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

50m

Dial Color

White

Jewels

36j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1966

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